AirHint found the following cheapest return flights from Athens (ATH) to Ljubljana (LJU) in September 2025 (see full year).

Return flights

12 Sep - 15 Sep	Aegean Airlines
12 Sep - 19 Sep	Aegean Airlines
12 Sep - 13 Sep	Aegean Airlines
12 Sep - 14 Sep	Aegean Airlines
12 Sep - 16 Sep	Aegean Airlines
26 Sep - 28 Sep	Air Serbia
19 Sep - 22 Sep	Air Serbia
18 Sep - 21 Sep	Air Serbia
19 Sep - 30 Sep	Air Serbia
26 Sep - 30 Sep	Air Serbia
21 Sep - 03 Oct	Air Serbia
23 Sep - 03 Oct	Air Serbia
22 Sep - 03 Oct	Air Serbia
29 Sep - 06 Oct	Aegean Airlines
29 Sep - 05 Oct	Aegean Airlines
22 Sep - 04 Oct	Air Serbia
26 Sep - 03 Oct	Aegean Airlines
26 Sep - 03 Oct	Aegean Airlines	direct
23 Sep - 03 Oct	Aegean Airlines	direct

Also check the deals for one-way flights from Athens to Ljubljana in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Athens to Ljubljana in September from 141€

Return flights